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Crystallinity of ethylene oxide oligomers

✍ Scribed by A. Marshall; R.C. Domszy; H.H. Teo; R.H. Mobbs; C. Booth

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
595 KB
Volume
17
Category
Article
ISSN
0014-3057

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✦ Synopsis

Abstraet--Nonaethylene glycol and pentadecaethylene glycol and their dimethyl ethers have been prepared and characterized, with respect to crystallinity by wide-and small-angle X-ray scattering, Raman scattering, i.r. spectroscopy and differential scanning calorimetry. Wide-angle X-ray scattering is similar to that from high molecular weight poly(ethylene oxide). The crystal habit is lamella. The lamellae are highly crystalline and the surface layers are ordered. Comparison with crystalline poly(ethylene oxide) prepared conventionally, and having a distribution of chain lengths, shows that such samples crystallize into lamellae with disordered surface layers.

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The changes in energy of the diethylene oxide dimethylether H&(OCH2CH2)20CHJ, oligomer of poly(ethylene oxide), as a function of rotation around C-C and C-O bonds have been analyzed by ab initio calculations. For the highest level calculations, MP2/6-31+ +G#//HF/3-21 G a gauche conformation around a